DeepSeek Releases Harness Agent Framework in Developer Preview Under MIT License

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DeepSeek launched Harness in developer preview, publishing it on GitHub under an MIT license with a plugin-based architecture built on the Cordis kernel. Every agent component — including models, tools, sandboxes, and scheduling — is a plugin, allowing developers to swap out individual parts via configuration files without modifying core code. The framework offers four runtime modes: Standard, Code, Minimal, and Creator, each suited to different use cases ranging from full-featured agent workflows to controlled benchmarking. Every session generates an append-only log capturing system prompts, tool calls, reasoning traces, and subagent activity, enabling detailed trajectory inspection and reproducible evaluation. Developers can run the framework locally using npx @deepseek-ai/dsh web, with the source available at github.com/deepseek-ai/deepseek-harness.

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